Hone



NOV. 8, 1932. M N PRANGE 1,886,584

HoNE

Original Filed NOV. 7, 19,27 2 Sheets-Sheet l Nov. 8, 1932. M. N. PRANGE HoNE l Original Filed Nov. 7, 1927 2 Sheets-Sheet 2 wNQM MM MM NW Q ww m Patented Nov. 8, 1932 Unita-,

oai-"ics MAURICE N. PRANGE, OF DETROIT, MICHIGAN, ASSIGNOR TO ELLEN MAY PBVAITG, OF DETROT, MECH'IGAN BONE Application 1ed November 7, 1927, Serial No. 231,730. Renewed July 21, 193.2.

This invention relates to hones for lapping tools and has as an object to improve generally and render more efficient devices of this character.

An object of this invention is to provide a lapping tool in which all danger of binding of the stones or blades will be obviated and by which a smooth and even grinding may be accomplished.

A further obj ect of this invention is to provide means for accurately adjusting the grinding stones, the said means being operable to adjust the stones either inwardlyr or outwardly.

A still further obj ect of this invention is to provide means for compensating for wear in the adjusting mechanism so that a positive adjustment of the stones will always be assured.

Another object of this invention is to provide a detachable driving connection for the hone, which connection will, however, be simple in construction and thoroughly efiicient in operation.

Other objects and advantages of the invention will become apparent as the following description proceeds particularly when reference is had to the accompanying drawings wherein;

Figure 1 is a side elevational view of a hone or lapping toolconstructed in accordance with my invention;

Figure 2 is a. longitudinal sectional view through the device shown in Figure 1;

Figure 3 is a sectional view taken on the line 3-3 of Figure 2;

Figure 4 is a sectional view taken on the line 4-4 of Figure 2;

Figure 5 is a sectional view taken on the line 5-5 of Figure 3;

Figure 6 is an end elevational view of the device with certain parts removed, and

Figure 7 is a perspective view of the stone holder forming a part of the device.

Referring now particularly to the drawings wherein lilre reference characters designate corresponding parts throughout all views of the same, the reference character A designates the cage of the lapping tool, B the stone holder and C the driving collar therefor.

-The cage A is a unitary structure preferably a single casting and includes the upper head 10, the lowerhead 11 and the ribs 12 connecting the upper and lower heads. As clearly illustrated in Figure 4 of the drawings, the ribs 12 are spaced circumferentially of the heads and are preferably triangular in cross section. The head is provided with a circumferential flange 13 apertured as at 14 for a purpose hereinafter tof be described and is further provided with a centrally arranged boss 15 provided with an opening 16 to form a bearing for the shaft of the adjusting mechanism also hereinafter to be described. The head 10 is also provided with a plurality of radiallyl extending slots or channels 17.

The lower head 11 of the cage is similar to the upper head 10v in that it is provided with a circumferentially arranged flange 18, the central boss 19 and the radially-extending slots 2O which are arranged in alignment with the slots 17 formed in the upper head 10. The boss 19 is also provided with an opening 21 simiiar to 'the boss of the upper head.

Adapted to be adjustably carried by the cage A are the stone holders B. As clearly illustrated in Figure 7 of thedrawings, these stone holders comprise trough-shaped members 22 provided with side walls 23 and 24. lNhile both of these walls slope outwardly from the base of the stone holder it will be noted that the wall 23 is arranged at a more obtuse angle to the base of thestone holder than is the wall 24 and that the wall 23 is provided with a plurality of bearing surfaces 25. rlhe other wall 24 is provided on its outer periphery with a plurality of ribs 2G provided with threaded openings 27 for the reception of adjusting screws 28. Arranged within the stone holder B is a stone 29 adapted to have one face clamped against the bearing surfaces by means of the adjusting screws 28. For preventing cracking of the stone 29 by the adjusting screws 28 and for effecting tighter clamping of the stone 29 l provide a bowed plate 30 adapted to engage the free side of the stone and adapted ltokbe forced against the stone by the said screws 28. It will thus be seen that by virtue of the slope of the wall 23 and also therefore of the bearing portions 25 the stone 29 willbe supported in the stone holder at an angle to the median plane of the holder.

For the purpose of'adjustably supporting the holders B within the cage there is provided at opposite ends of each holder B flanges 31. These flanges are provided onl theirouter free edges with teeth 32'and are adapted to be slidably received in the chan'- nels or slots 17 and 2O as clearly illustrated in Figure 2 of the drawings. By reference* reference to Figure l, that the flanges 31 are arranged to one side of the median plane of the holder so that the median plane of the holder does not coincide Vwith the radial planes of the cage. It is byfvirtue of this feature, together with the arrangement of the stone within the holder that I am able to preclude the possibility of the stones binding when the lapping tool is being used.

For adjusting the stone holders radially of the cage there is provided kupper andlower scrolls 33v and 34 respectively, these scrolls being arranged adjacent the upper and lower heads of the cage as clearly illustrated in Figure 2 of the drawings. The upper scroll 33 has a bearing as at 35 on the outer end of the boss 10 and is also provided on its outer face with a centrally arranged boss 36 grooved as at 37. Spiral teeth 38 arranged on the inner face of the scroll 33 are adapted to mesh with the teeth 32 ofthe flanges on the upper ends of the stone holders so that the rotation of the scroll 33 tends to move the said stone holders outwardly or inwardly. As clearly illustrated in Figure 2 lof the drawings, the spiral teeth 38 arealso pro vided with one vertical face which engages the vertical faces of the teeth32 whereby, as brought out before, an accurate and positive adjustment of the stone holders is assured.

Lower scroll 34 is similar in structure to the upper scroll 33 in that it is provided with a bearing 39 on the boss 19 of the lower head. The lower scroll is also provided with the teeth 40 adapted to mesh with the teeth 32 formed on the flanges on the lower ends of the stone holders and it is to be noted that these teeth are also provided with one vertical face. The lower scroll is further provided on its outer face with a boss 41 grooved asat42. w

adapted to be received in the groove 37 in the boss 36; The lower end of theshaft 43 is threaded as at 47 and is provided adjacent its threaded portion with a transverse opening 48 adapted toreceive a pin 49-which engages .in the groove 42 in the boss 41. VIt will thus be seenv that by virtue of the projections'46 and/the -pin 49 rotativemovement of the upper scroll 33 will be transmitted to the lower scroll 34.

For drawing the lower scroll 34 closer to the upper scroll 33, there is provided a disk 50 threadedly engaging the threaded end 47 of the shaft 43. The disk 50 is provided with a boss 51 having a plurality of radial grooves 52 and a pin 53 is adapted to rbe inserted through the end of the shaft 43 and to seat in selected ones of these grooves. It will thus be seen that by removing the pin 53 the disk 5() may be tightened on the shaft l43 to force the scrolls 33 and 34 into firmer mesh with the teeth on the flanges 31 and that after the disk 50 is so tightened, it maybe locked in its tightened position by the pin 53. Further it will be seen that by drawing the scrolls closer together compensation may be made for any wear on the teeth of the scrolls 33 and 34 and the teeth on theflanges 31.

Mounted on the upper end of the cage VA is the driving collar C. This driving collar is provided wtih a reduced end portion 54 vadapted to be received within the flange 13 formed on the upper head 10 and is adapted to be held in assembled position by suitable threaded members 55 extending through the openings 14 formed in the flange 13. The wallscof the driving collarC is provided at two diametrically opposite points with thickened portions 56 and 57' respectively and extendingthrough one of these thickened portions there is arranged the means for imparting rotary motion to the upper scroll 33. This means includes `a shaft 58 journalled in the thickenedportion 56 and provided at its inner end with a pinion 59 adapted to mesh with teeth 60 formed on a boss 61 carried by the upper scroll 33. The outer end of the shaft 58 is provided with a head 62 yfor engagementwith asuitable adjusting tool. l

Obviously, adjustment of the stone holders isaccomplished by rotation of the shaft 58 which is transmitted through the pinion 59 yand teeth 60 to the scrolls 33 and 34. As brought out before, rotation of the scrolls 33 UJI and 3.4 radially moves the stone holders by engagement with the teeth 32.

For driving the lapping tool there is provided a shank driver 63 having a flattened head 6l arranged at one end and a threaded socket 65 arranged at its other end for engageinentl with the threaded end of a suitable driving shaft 66. Pivotally secured to the flattened head 6d of the drive shank as by a pin 67 is a double yoke-like member 68 terminating at its opposite ends in pintles 69. These pintles are adapted to engage in the driving collar C for transmitting the rotation of the shaft 66 to the lapping tool.

For providing a detachable connection between the pintles 69 and the drive collar C, the drive collar is provided on its inner periphery with segmental circumferentially arranged iianges 70 and 71. As clearly illustrated in Figure 5 of the drawings the flange 70 extends from the thickened portion 57 to a point spaced from the thickened portion 56 so as to form an entrance channel 72 while he flange 7l extends from the thickened portion 56 to a point spaced from the thickened portion 57 to provide the entrance channel or passage 73. Secured to the base of the adjusting collar C is an annular ring 7 d which forms a flange projecting inwardly of the wall of the adjusting collar, this flange cooperating with the flanges 70 and 7l toform channels 75 and 76 within the adjusting collar C. To connect the yoke 68 to the drive collar the pint-les 69 are passed through the passages 72 and 7 3 into the channels 75 and 76 respectively and the yoke is then turned until the pintles 69 are moved within the channels 75 and 76 to positions adjacent the thickened portions 56 and 57. For preventing movement of the pintles 69 out of the channels 75 and 76 suitable pins 77 are detachably mounted in openings 7 8 formed in the flanges 70 and 7l, these pins extending across the channels 75 and 76 as will be readily apparent.

In operation the lapping tool is adapted to be inserted within a cylinder and rotated to cause the stones 29 to grind the Walls of the cylinder. By virtue of the arrangement of the stones 29 at an angle to the median plane of the holders C and by virtue also of the offset positions of the lianges 3l, on the holders C, the stones 29 will be carried at an angle to the radial planes of the cage A and will thereby engage the walls of the cylinder in such a manner as to be incapable of binding. lVhile I have shown and described one form which my invention may assume, it is to be understood that this disclosure is for the purpose of illustration only and is not to be construed as denitive of the limits of my inventive idea. I therefore reserve the right to make such changes in the details of construction and arrangement of parts as will fall within the purview of the accompanying claims. f'

Vhat I claim as my invention is:

l. In a lapping tool, a cage, a stone holder carried by said cage, a stone lwithin said holder, and means for clamping said stone within said holder at an angle to the lmedian plane thereof, said means including a resilient plate arranged within the said holder and at one side of the said stone, and a threaded member carried by the said holder and engaging the said plate.

2. In a lapping tool, a trough-like stone holder having a side wall sloping outwardly from its base, a stone within said holder, a bowed plate arranged 'adjacent one side of said stone and members carried by said holder and engaging said plate to force said stone against the sloping side wall of said holder.

3. In a lapping tool, a cage provided with a radial channel, a stone holder, and al flange formed on said holder to one side of the longitudinal median plane thereof, for engagement in the said channel.

l. In a hone, a cage having upper and lower heads, each of said heads being provided with a radially extending channel, a stone holder, and a flange on each end of the said stone holder, the said flanges being adapted for engagement in the said channels and being arranged to one side of the longi tudin'al median plane of said holder.

5. In a hone, a cage having a head and a radially extending channel in said head, a stone holder and ya flange on said holder arranged to one side of the longitudinal median plane of said holder, said flange being engageable in said channel for mounting said stone holder on said cage with its median plane angularly arranged with respect to the radial planes of said cage.

6. In a lapping tool, a cage, stone holders carried by said cage, and means for adjusting said stone holders radially of said cage, said means including a scroll at one end of said cage, a shaft having a pinion on one end for driving said scroll, a head on the other end of said shaft for engagement by 'a turning tool, a second scroll, and means for driving said second scroll from said first mentioned scroll, said means including a shaft arranged centrally of said cage, transverse pins carried by said shaft for engagement with said scrolls, yand means carried by said shaft for varying the spaced relation of said scrolls on said shaft.

7 In a lapping tool, a stone holder, a stone within said holder, and means including a bowed resilient plate engageable with one side of said stone for clamping said stone against a wall of said holder.

8. In a lapping tool, a cage, a head for said cage, said head having a radially extending channel, a stone holder, and a flange on said i .,9

stone holder engageable in said channel, said flange being arranged to one side of the longitudinal median plane of said holder whereby said holder is angularly positioned relativeltol the radial planes of-said cage. n

9. In a lapping tool, a tool holder having spaced side Wells, astone Within the holder, and means including a resilient member interposed between one of the side Walls afores'aid and the stone for clampinglthe latter against the other of seid side wells.

In testimony whereof I affix my signa-ture.

` MAURICE N. PRANGE. 

